Fix ICE when using -gcodeview with empty struct

Empty structs result in empty LF_FIELDLIST types, which are valid, but
we weren't accounting for this and assuming they had to contain
subtypes.

gcc/
	* dwarf2codeview.cc (get_type_num_struct): Fix NULL pointer dereference.

diff --git a/gcc/dwarf2codeview.cc b/gcc/dwarf2codeview.cc
index b16c6960f63e8a3761248729e92ed9e9d7c069c2..470cbae711037a04df44d093c2f5676a1395722e 100644 (file)
--- a/gcc/dwarf2codeview.cc
+++ b/gcc/dwarf2codeview.cc
@@ -2858,8 +2858,11 @@ get_type_num_struct (dw_die_ref type, bool in_struct, bool *is_fwd_ref)
       ct2 = ct->next;
       ct->next = NULL;
 
-      if (ct->lf_fieldlist.last_subtype->kind == LF_INDEX)
-       ct->lf_fieldlist.last_subtype->lf_index.type_num = last_type;
+      if (ct->lf_fieldlist.last_subtype
+         && ct->lf_fieldlist.last_subtype->kind == LF_INDEX)
+       {
+         ct->lf_fieldlist.last_subtype->lf_index.type_num = last_type;
+       }
 
       add_custom_type (ct);
       last_type = ct->num;